1 files changed, 443 insertions, 0 deletions
diff --git a/vpp/vppinfra/vppinfra/serialize.h b/vpp/vppinfra/vppinfra/serialize.h
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+++ b/vpp/vppinfra/vppinfra/serialize.h
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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+  Copyright (c) 2005 Eliot Dresselhaus
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef included_clib_serialize_h
+#define included_clib_serialize_h
+
+#include <stdarg.h>
+#include <vppinfra/byte_order.h>
+#include <vppinfra/types.h>
+#include <vppinfra/vec.h>
+#include <vppinfra/longjmp.h>
+
+struct serialize_main_header_t;
+struct serialize_stream_t;
+
+typedef void (serialize_data_function_t) (struct serialize_main_header_t * h,
+					  struct serialize_stream_t * s);
+
+typedef struct serialize_stream_t
+{
+  /* Current data buffer being serialized/unserialized. */
+  u8 *buffer;
+
+  /* Size of buffer in bytes. */
+  u32 n_buffer_bytes;
+
+  /* Current index into buffer. */
+  u32 current_buffer_index;
+
+  /* Overflow buffer for when there is not enough room at the end of
+     buffer to hold serialized/unserialized data. */
+  u8 *overflow_buffer;
+
+  /* Current index in overflow buffer for reads. */
+  u32 current_overflow_index;
+
+  u32 flags;
+#define SERIALIZE_END_OF_STREAM (1 << 0)
+
+  uword data_function_opaque;
+
+  u32 opaque[64 - 4 * sizeof (u32) - 1 * sizeof (uword) -
+	     2 * sizeof (void *)];
+} serialize_stream_t;
+
+always_inline void
+serialize_stream_set_end_of_stream (serialize_stream_t * s)
+{
+  s->flags |= SERIALIZE_END_OF_STREAM;
+}
+
+always_inline uword
+serialize_stream_is_end_of_stream (serialize_stream_t * s)
+{
+  return (s->flags & SERIALIZE_END_OF_STREAM) != 0;
+}
+
+typedef struct serialize_main_header_t
+{
+  u32 recursion_level;
+
+  /* Data callback function and opaque data. */
+  serialize_data_function_t *data_function;
+
+  /* Error if signaled by data function. */
+  clib_error_t *error;
+
+  /* Exit unwind point if error occurs. */
+  clib_longjmp_t error_longjmp;
+} serialize_main_header_t;
+
+always_inline void
+serialize_error (serialize_main_header_t * m, clib_error_t * error)
+{
+  clib_longjmp (&m->error_longjmp, pointer_to_uword (error));
+}
+
+#define serialize_error_return(m,args...)			\
+  serialize_error (&(m)->header, clib_error_return (0, args))
+
+void *serialize_read_write_not_inline (serialize_main_header_t * m,
+				       serialize_stream_t * s,
+				       uword n_bytes, uword flags);
+
+#define SERIALIZE_FLAG_IS_READ  (1 << 0)
+#define SERIALIZE_FLAG_IS_WRITE (1 << 1)
+
+always_inline void *
+serialize_stream_read_write (serialize_main_header_t * header,
+			     serialize_stream_t * s,
+			     uword n_bytes, uword flags)
+{
+  uword i, j, l;
+
+  l = vec_len (s->overflow_buffer);
+  i = s->current_buffer_index;
+  j = i + n_bytes;
+  s->current_buffer_index = j;
+  if (l == 0 && j <= s->n_buffer_bytes)
+    {
+      return s->buffer + i;
+    }
+  else
+    {
+      s->current_buffer_index = i;
+      return serialize_read_write_not_inline (header, s, n_bytes, flags);
+    }
+}
+
+typedef struct
+{
+  serialize_main_header_t header;
+  serialize_stream_t stream;
+} serialize_main_t;
+
+always_inline void
+serialize_set_end_of_stream (serialize_main_t * m)
+{
+  serialize_stream_set_end_of_stream (&m->stream);
+}
+
+always_inline uword
+serialize_is_end_of_stream (serialize_main_t * m)
+{
+  return serialize_stream_is_end_of_stream (&m->stream);
+}
+
+typedef struct
+{
+  serialize_main_header_t header;
+  serialize_stream_t *streams;
+} serialize_multiple_main_t;
+
+typedef void (serialize_function_t) (serialize_main_t * m, va_list * va);
+
+always_inline void *
+unserialize_get (serialize_main_t * m, uword n_bytes)
+{
+  return serialize_stream_read_write (&m->header, &m->stream, n_bytes,
+				      SERIALIZE_FLAG_IS_READ);
+}
+
+always_inline void *
+serialize_get (serialize_main_t * m, uword n_bytes)
+{
+  return serialize_stream_read_write (&m->header, &m->stream, n_bytes,
+				      SERIALIZE_FLAG_IS_WRITE);
+}
+
+always_inline void
+serialize_integer (serialize_main_t * m, u64 x, u32 n_bytes)
+{
+  u8 *p = serialize_get (m, n_bytes);
+  if (n_bytes == 1)
+    p[0] = x;
+  else if (n_bytes == 2)
+    clib_mem_unaligned (p, u16) = clib_host_to_net_u16 (x);
+  else if (n_bytes == 4)
+    clib_mem_unaligned (p, u32) = clib_host_to_net_u32 (x);
+  else if (n_bytes == 8)
+    clib_mem_unaligned (p, u64) = clib_host_to_net_u64 (x);
+  else
+    ASSERT (0);
+}
+
+always_inline void
+unserialize_integer (serialize_main_t * m, void *x, u32 n_bytes)
+{
+  u8 *p = unserialize_get (m, n_bytes);
+  if (n_bytes == 1)
+    *(u8 *) x = p[0];
+  else if (n_bytes == 2)
+    *(u16 *) x = clib_net_to_host_unaligned_mem_u16 ((u16 *) p);
+  else if (n_bytes == 4)
+    *(u32 *) x = clib_net_to_host_unaligned_mem_u32 ((u32 *) p);
+  else if (n_bytes == 8)
+    *(u64 *) x = clib_net_to_host_unaligned_mem_u64 ((u64 *) p);
+  else
+    ASSERT (0);
+}
+
+/* As above but tries to be more compact. */
+always_inline void
+serialize_likely_small_unsigned_integer (serialize_main_t * m, u64 x)
+{
+  u64 r = x;
+  u8 *p;
+
+  /* Low bit set means it fits into 1 byte. */
+  if (r < (1 << 7))
+    {
+      p = serialize_get (m, 1);
+      p[0] = 1 + 2 * r;
+      return;
+    }
+
+  /* Low 2 bits 1 0 means it fits into 2 bytes. */
+  r -= (1 << 7);
+  if (r < (1 << 14))
+    {
+      p = serialize_get (m, 2);
+      clib_mem_unaligned (p, u16) = clib_host_to_little_u16 (4 * r + 2);
+      return;
+    }
+
+  r -= (1 << 14);
+  if (r < (1 << 29))
+    {
+      p = serialize_get (m, 4);
+      clib_mem_unaligned (p, u32) = clib_host_to_little_u32 (8 * r + 4);
+      return;
+    }
+
+  p = serialize_get (m, 9);
+  p[0] = 0;			/* Only low 3 bits are used. */
+  clib_mem_unaligned (p + 1, u64) = clib_host_to_little_u64 (x);
+}
+
+always_inline u64
+unserialize_likely_small_unsigned_integer (serialize_main_t * m)
+{
+  u8 *p = unserialize_get (m, 1);
+  u64 r;
+  u32 y = p[0];
+
+  if (y & 1)
+    return y / 2;
+
+  r = 1 << 7;
+  if (y & 2)
+    {
+      p = unserialize_get (m, 1);
+      r += (y / 4) + (p[0] << 6);
+      return r;
+    }
+
+  r += 1 << 14;
+  if (y & 4)
+    {
+      p = unserialize_get (m, 3);
+      r += ((y / 8)
+	    + (p[0] << (5 + 8 * 0))
+	    + (p[1] << (5 + 8 * 1)) + (p[2] << (5 + 8 * 2)));
+      return r;
+    }
+
+  p = unserialize_get (m, 8);
+  r = clib_mem_unaligned (p, u64);
+  r = clib_little_to_host_u64 (r);
+
+  return r;
+}
+
+always_inline void
+serialize_likely_small_signed_integer (serialize_main_t * m, i64 s)
+{
+  u64 u = s < 0 ? -(2 * s + 1) : 2 * s;
+  serialize_likely_small_unsigned_integer (m, u);
+}
+
+always_inline i64
+unserialize_likely_small_signed_integer (serialize_main_t * m)
+{
+  u64 u = unserialize_likely_small_unsigned_integer (m);
+  i64 s = u / 2;
+  return (u & 1) ? -s : s;
+}
+
+void
+serialize_multiple_1 (serialize_main_t * m,
+		      void *data, uword data_stride, uword n_data);
+void
+serialize_multiple_2 (serialize_main_t * m,
+		      void *data, uword data_stride, uword n_data);
+void
+serialize_multiple_4 (serialize_main_t * m,
+		      void *data, uword data_stride, uword n_data);
+
+void
+unserialize_multiple_1 (serialize_main_t * m,
+			void *data, uword data_stride, uword n_data);
+void
+unserialize_multiple_2 (serialize_main_t * m,
+			void *data, uword data_stride, uword n_data);
+void
+unserialize_multiple_4 (serialize_main_t * m,
+			void *data, uword data_stride, uword n_data);
+
+always_inline void
+serialize_multiple (serialize_main_t * m,
+		    void *data,
+		    uword n_data_bytes, uword data_stride, uword n_data)
+{
+  if (n_data_bytes == 1)
+    serialize_multiple_1 (m, data, data_stride, n_data);
+  else if (n_data_bytes == 2)
+    serialize_multiple_2 (m, data, data_stride, n_data);
+  else if (n_data_bytes == 4)
+    serialize_multiple_4 (m, data, data_stride, n_data);
+  else
+    ASSERT (0);
+}
+
+always_inline void
+unserialize_multiple (serialize_main_t * m,
+		      void *data,
+		      uword n_data_bytes, uword data_stride, uword n_data)
+{
+  if (n_data_bytes == 1)
+    unserialize_multiple_1 (m, data, data_stride, n_data);
+  else if (n_data_bytes == 2)
+    unserialize_multiple_2 (m, data, data_stride, n_data);
+  else if (n_data_bytes == 4)
+    unserialize_multiple_4 (m, data, data_stride, n_data);
+  else
+    ASSERT (0);
+}
+
+/* Basic types. */
+serialize_function_t serialize_64, unserialize_64;
+serialize_function_t serialize_32, unserialize_32;
+serialize_function_t serialize_16, unserialize_16;
+serialize_function_t serialize_8, unserialize_8;
+serialize_function_t serialize_f64, unserialize_f64;
+serialize_function_t serialize_f32, unserialize_f32;
+
+/* Basic vector types. */
+serialize_function_t serialize_vec_8, unserialize_vec_8;
+serialize_function_t serialize_vec_16, unserialize_vec_16;
+serialize_function_t serialize_vec_32, unserialize_vec_32;
+serialize_function_t serialize_vec_64, unserialize_vec_64;
+
+/* Serialize generic vectors. */
+serialize_function_t serialize_vector, unserialize_vector,
+  unserialize_aligned_vector;
+
+#define vec_serialize(m,v,f) \
+  serialize ((m), serialize_vector, (v), sizeof ((v)[0]), (f))
+
+#define vec_unserialize(m,v,f) \
+  unserialize ((m), unserialize_vector, (v), sizeof ((*(v))[0]), (f))
+
+#define vec_unserialize_aligned(m,v,f) \
+  unserialize ((m), unserialize_aligned_vector, (v), sizeof ((*(v))[0]), (f))
+
+/* Serialize pools. */
+serialize_function_t serialize_pool, unserialize_pool,
+  unserialize_aligned_pool;
+
+#define pool_serialize(m,v,f) \
+  serialize ((m), serialize_pool, (v), sizeof ((v)[0]), (f))
+
+#define pool_unserialize(m,v,f) \
+  unserialize ((m), unserialize_pool, (v), sizeof ((*(v))[0]), (f))
+
+#define pool_unserialize_aligned(m,v,a,f)				\
+  unserialize ((m), unserialize_aligned_pool, (v), sizeof ((*(v))[0]), (a), (f))
+
+/* Serialize heaps. */
+serialize_function_t serialize_heap, unserialize_heap;
+
+void serialize_bitmap (serialize_main_t * m, uword * b);
+uword *unserialize_bitmap (serialize_main_t * m);
+
+void serialize_cstring (serialize_main_t * m, char *string);
+void unserialize_cstring (serialize_main_t * m, char **string);
+
+void serialize_close (serialize_main_t * m);
+void unserialize_close (serialize_main_t * m);
+
+void serialize_open_data (serialize_main_t * m, u8 * data,
+			  uword n_data_bytes);
+void unserialize_open_data (serialize_main_t * m, u8 * data,
+			    uword n_data_bytes);
+
+/* Starts serialization with expanding vector as buffer. */
+void serialize_open_vector (serialize_main_t * m, u8 * vector);
+
+/* Serialization is done: returns vector buffer to caller. */
+void *serialize_close_vector (serialize_main_t * m);
+
+void unserialize_open_vector (serialize_main_t * m, u8 * vector);
+
+#ifdef CLIB_UNIX
+clib_error_t *serialize_open_unix_file (serialize_main_t * m, char *file);
+clib_error_t *unserialize_open_unix_file (serialize_main_t * m, char *file);
+
+void serialize_open_unix_file_descriptor (serialize_main_t * m, int fd);
+void unserialize_open_unix_file_descriptor (serialize_main_t * m, int fd);
+#endif /* CLIB_UNIX */
+
+/* Main routines. */
+clib_error_t *serialize (serialize_main_t * m, ...);
+clib_error_t *unserialize (serialize_main_t * m, ...);
+clib_error_t *va_serialize (serialize_main_t * m, va_list * va);
+
+void serialize_magic (serialize_main_t * m, void *magic, u32 magic_bytes);
+void unserialize_check_magic (serialize_main_t * m, void *magic,
+			      u32 magic_bytes);
+
+#endif /* included_clib_serialize_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */